Thank you!!!
I believe it will be. I have four (4) 25" (w) x 14" (h) grilles in one 36" (w) x 84" (h) door at the moment. This closet has four (4) of those 36" (w) doors [2 on each side]. I'm only putting grilles in the doors as they are needed when rigs are added. You can see 4 grilles in one of the doors on the back left. I will also custom make a means of holding filters in the grilles that can be replaced periodically.
I built this closet downstairs in the recreation room. It naturally stays cooler downstairs since cool air descends and heat ascends. It will be much easier to keep the sound to a minimum downstairs in the basement. Having them in my present closet reduces the noise dramatically. The door to that closet has an 18" (w) by 25" (h) filtered grille installed in it. There is a huge difference in noise with the rigs inclosed in structures like this.